.container{
    text-align: center;
}
header .container{
    background: #e9ecef;
    padding-top: 50px;
    padding-bottom: 50px;
}
.top button{
    cursor: pointer;
}
.c3,.btn{
    background: #5aaaff;
}
.c4,.but{
    background: #fff;
    color: #212529;
}
#z1,#z4,#z2,#z5{
    padding: 20px 48px;
}
textarea{
    width: 550px;
    height: 133px;
}
button{
    border: 0;
}
a{
    padding: 15px 100px;
    background: #007bff;
    border: 1px solid #007bff;
    display: inline-block;
    text-decoration: none;
    color: #212529;
    cursor: pointer;
}
.c{
    cursor: pointer;
    margin: 30px 172px;
    padding: 15px 120px;
    border-radius: 25px;
}
 .b{
    text-align: center;

}